I would have to pick me. Not sure I would trust that much power in any one elses hands.

First thing I would do is alter the metabolism of all creatures that have to kill in order to survive and change it to a photosynthesis way of obtaining energy to live.
Second, all trash, pollutants, hazardous waste, etc would be removed from the world. All nukes would be gone.
All houses altered to be perfectly energy efficient with greenhouses and no need for the burning of fossil fuels.

The desire to rape or murder would be gone.
Oh the changes I would make. They would be many.

Insanity - doing the same thing over and over again and expecting different results

The Egyptian god Eris. That way I can be a part of the discoridian religion. Since their main mantra is no order, only chaos. It would be orderly for me to believe in Eris. So to worship Eris I would not believe in her.